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If you want to replace a 3 kg motor (Bosch 750) with a 600 gram motor (propdrive 5060) you'll need more of'm.
Also, smaller motors run faster (the slowest propdrive is 270 KV, 2 times faster than the Bosch 750)

In short, if you want to have the equivalent of a "bosch 750" drive in propdrives 5060 you want at least 4 of'm, and be prepared for a higher gearratio.

The data from Robot Marketplace gives this motor a 500W rating.
You can get a heavy moving with those, but you won't be happy with the results.
If you want any acceleration, you'll have to use a gearratio of 6-7 to 1 with the 4" wheel. Trundling around @10kph. But you'll be there in a jiffi.

BIG brushless, with heaping piles of power. Not some weedy 500W wheelchair motors.

I guess something like the Rotomax 80CC or bigger.

Bananaking, a Russian machine, uses Revolt motors, and because decent Brushless controlers for this kind of power ain't common (MGM Compro is one of the few commercial options at €800+ a pop) he went with Euans 300A VESC's (see that thread). Another thing were Ellis is involved with.